Gate Exam Numerical Ability Profit and Loss

The transport layer protocols used for real time multimedia, file transfer, DNS and email, respectively are

Option
(A) TCP, UDP, UDP and TCP
(B) UDP, TCP, TCP and UDP
(C) UDP, TCP, UDP and TCP
(D) TCP, UDP, TCP and UDP

Read Solution (Total 1)

TCP (Transmission Control Protocol) and UDP(User Datagram Protocol) are two main transport layer protocols.
TCP is connection oriented and UDP is connectionless, this makes TCP more reliable than UDP. But UDP is stateless (less overhead), that makes UDP is suitable for purposes where error checking and correction is less important than timely delivery.
For real time multimedia, timely delivery is more important than correctness. –> UDP
For file transfer, correctness is necessary. –> TCP
DNS, timely delivery is more important –> UDP
Email again same as file transfer –> TCP
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Gate Other Question

Assume that source S and destination D are connected through two intermediate routers labeled R. Determine how many times each packet has to visit the network layer and the data link layer during a transmission from S to D.

Option
(A) Network layer -4 times and Data link layer-4 times
(B) Network layer -4 times and Data link layer-3 times
(C) Network layer -4 times and Data link layer-6 times
(D) Network layer -2 times and Data link layer-6 times Using public key cryptography, X adds a digital signature s to message M, encrypts , and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations?
(A) Encryption: X's private key followed by Y's private key; Decryption: X's public
key followed by Y's public key
(B) Encryption: X's private key followed by Y's public key; Decryption: X's public
key followed by Y's private key
(C) Encryption: X's public key followed by Y's private key; Decryption: Y's public
key followed by X's private key
(D) Encryption: X's private key followed by Y's public key; Decryption: Y's private
key followed by X's public key